Carbon dynamics of the grass, fern and shrub communities in Hong Kong were studied based on the estimation of their biomass and net primary production (NPP). The results showed that carbon storage of plants in the grassland, fernland and shrubland were 377, 871 and 1448 g/m 2 respectively. The carbon storage of soil was larger than that of plants in the three communities. The carbon amounts assimilated for NPP and net accumulative biomass were 332, 489, 469 g/m 2· a and 87, 246, 185 g/m 2·a respectively....